Which of the following best describes indirect transmission?

• A. A contaminated inanimate object or surface
• B. Direct contact between people
• C. Airborne droplets from coughing
• D. Bloodborne transmission

Answer: (A)

Indirect transmission happens when a pathogen moves through an intermediary object or the environment rather than from one person directly to another. A contaminated inanimate object or surface fits this best because the pathogen can linger on the surface (a fomite) and be picked up by someone who touches it, then transfers to their mouth, nose, or eyes or to another object.

Direct contact between people involves touching an infected person or their secretions, which is not indirect. Airborne droplets from coughing travel through the air to another person, representing transmission through the respiratory route rather than via a surface. Bloodborne transmission occurs when exposure is to infected blood, such as through a needlestick, which is also a direct exposure to infectious material.